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(No Model.) v 5 Sheets-Sheet 1. G. L. THIELL.

APPARATUS POR GONTROLLING THE ADMISSION P AIR TO PURNAGES.

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5 Sheets-Sheet 2.

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G. L. THIELL. APPARATUS FOR SONTROLLING THB ADMISSION 0F AIR To PURNAGBS.

No. 526,510. Patented Sept. 25, 1894.

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G. L. THIELL. APPARATUS POR SUNTSOLLING. THB ADMISSION 0F AIR To FURNAGBS. No. 526,510. Patented Sept. 25, 1894.

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G. L. THIELL. APPARATUS FOR GONTROLLING T HE ADMISSION 0F AIR To EURNAGES. No. 526,510. Patented Sept. 25, 1894.

5 Sheets-Sheet 5.

(No Model.)

t e. L. THIBLL. APPARATUS FOR GONTROLLING THE ADMISSION 0F AIR TO PURNACBS.

No. 526,510. Patented Sept. 25, 1894.

- INVENT F;

WITNEEEEE- PnrnnrrV OFFICE.

GECRGE LANDERTHIELL, OF BALTIMORE, MARYLAND, ASSIGNOR TO THE THIELL COMBUSTIONv GOVERNOR BALTIMORE CITY.

ANDv MANUFACTURING COMPANY OF APPARATUS FOR CONTROLLING THE ADMiSSION OF AIR T0 FURNACES.

SPECIFICATION forming part of Letterslatent N70. 526,510, dated September 25, 1894. Application filed March 24, 1893. Renewed February 27, 1894. lSerial lla-501.729. (No model.)

To all whom it may concern.-

Be it known that I, GEORGE LANDER THIELL, ofthe city of Baltimore and State of Maryland, have invented certain Improve- V ments in Apparatus for Controlling the Admission of Air to Furnaces,ot` which the following is a specification.

In the description of the said inventio which follows, reference is made to the ac- Io companying drawings forminga part hereof,

and in which- Figure 1 is a longitudinal section of a water tube boiler and its' brickwork setting, provided with the present invention. Fig. 2 is an enlarged partially sectional view of the improved apparatus. Fig. 3 is a topview of Fi 2. Fig. 4 is an exterior view of certain `parts of the apparatus looking in the direc, ti0n=indicated by the arrow in Fig. 2. Fig. zo 5is a still enlarged view of certain parts of theinvention shown in' Fig. '2. Figs. 6 and 7 are details of the invention, the former being a sectionfof Fig. 5 taken on the dotted line y-y Fig. 8 is an enlarged cross section of a iiue boiler to which the invention is applied.

Referring to the drawings, A represents a boiler which in Fig. 1 is of the water tube, 'and in Fig. 8 of the ordinary flue type, and 3o B the brick workY setting. p

C is a box in two parts or sections having a suitable stand a. This box is placed in any convenient position knear the boiler A, and in the drawings is shown as seated on 3 5 the top of the brick work setting. V

' Between the two parts b and c of the box C is a flexible diaphragm D held in place by the bolts d which also hold the two parts b and c of the box C together. This diaphragm 4.o may befmade of any suitable material, but cotton duck treated with rubber is preferred. E and F are circular metal plates ilat or corrugated situated respectively on the top and bottom of the diaphragm D to which 45 they are fastened by bolts e.

G is a'stem which passes through an apery ture f in the top section b of the box C, and

at the lower end the stem Vis attachedin any suitable manner to the plate E. The upper end of this stem is jointed to a lever H having its f ulcrurn in a stand I seated on the'section b of the box C. The long arm g of the lever H is connected by a rod Jto the damper lever K of the damperL which damper is hung in the iiue M of the brick workV setting B.

The lower section c of the box C isincommunication with the combustion chamber N of the boiler at the back of the bridge wall' h by means of a pipe O. This pipe is shown in Figs. l and 8, and the nozzle on the box C to which the pipeis attached is represented in dotted lines in Fig. 3.

The upper section b of the box C is in communication with the outer air through the medium of the aperture f before referred to.

From this description it' will be seen that the lower side of the diaphragm is exposed to A the gases in the combustion chamber, and the upper side exposed to the outer air, and

that theposition of the diaphragm within the box is governed by the relative the said gases, and the air.

supposing the damper L to be in such positionl in the tlue M as will give the proper admission of air to the furnace to eect ecopressures of f nomical combustion of the fuel therein, and

by careless firing, a portion of the grate bars becomes exposed thereby admitting more air tothe combustion chamber than is requisite, the pressure in the combustion chamber is increased, or brought nearer to that of the outer air. This causes the diaphragm to rise and the damper L to close.

The conditions just described are well illustrated in Fig. 1 in which a bare spot is shown on the grate bars, and the damper closed. When the bare spot is covered with coal, the damper is opened automatically and placed in `its proper position.

When the furnace door is opened in the firing operation, the damper is closed in a similar manner to that above described. When, however, by' bad firing, the bed of coal on the grate bars becomes too thick so that the air admitted is insufficient, the pressure in the combustion chamber is reduced, and bythe depression of the diaphragm the damper is opened.

From the foregoing it will be seen that the diaphragm thoroughly and eifectually controls the admission of air to the furnace and is effective in opening and closing the damper to prevent the admission ofV too much or too little air to the furnace, and the waste of fuel; but the economical expenditure of a certain quantity of fuel may produce more steam than is required for the work to be performed, and it is necessary, therefore, to close the damper independently of the devices befor described when. the extreme limit of allowable pressure is attained. I effect this result as follows: Immediately underneath the short arm of the lever II and supported, preferably, bythe stand I, is a steam or water cylinder P having a piston Q therein. Between the top of the piston Q and a screw cap R and coiled about the piston rod S is confined a spiral spring T. Leading from the space under the piston Q is a nozzlej connected by a nipple k to a valve chamber U hereinafter described. To the other end of this valve ,chamber is attached the nozzle m of a regulating valve chamber V. This regulating valve chamber is in two parts??J and o which l are flanged and bolted together, and between them is confined a metallic diaphragm 19.

Between the upper side of the diaphragm p and a hollow adjusting nut q screwed into the part n of the valve chamber, is a spiral spring W seated on a convex plate 7'. Beneath this diaphragm p is a stem A having a head s in contact with the said diaphragm.

Confined endwise between the head s and the bottom of a recess t in the part o' of the,

' valve chamber is a spiral spring u.

A nozzle a. leads from the space below the diaphragm p and into itis screwed a pipe a2 shown particularly in Fig. 8 which connects the said space with the steam roomv of the boiler. The lower end b of the part o of the valve chamber V is threaded to admit of the connection of a pipe b2, shown in Fig. 8, which unites that part of the valve chamber with the water space, of the boiler, or to any source of supply of water under pressure. Screwed into this end b is a sleeve c the upper end of which serves as a seat for ayalve d which is situated between it, and the lower end of the stem A.

Within the valve chamber U isa hollow.

or steam from the chamber U, under circum-Y stances hereinafter described.

Between the port m and the face on which the valve B seats itself isa channel n cut in the wall of the chamber U for a purpose hereinafter described. V

To prepare this second part of the invention for use the hollow adjusting nut q is screwed either up or down, until the strain on the spring IV is such that it will be overcome only by the maximum pressure of steam to be carried on the boiler. Now supposing that the steam in the boiler should attain that pressure which is, say, one hundred pounds to the square inch, the diaphragm p is forced up by the steam thereby compressing the spring lV. stem A is allowed to rise and the pressure of water or steam under the valve d lifts it, and water or steam from-the boiler or some other source of supply passes into the valve chamber U and forces the valve B to its seat. At the same time the water or steam passes through the central perforation k in the valve B and unseats the spring-supported valve g. This allows the full pressure of steam or water to pass to the cylinder P, and raise the piston therein, in which operation the spring T is compressed.

The lifting of the piston brings the piston rod S forcibly into contact with the under side of the short arm of the lever I-I and the damper L is immediately closed.

In the seati-ng of the valve B the port m leading to the discharge nozzle C is closed but there is a small discharge through the channel n.

The relative positions of the parts as described are maintained until steam in the boiler fallsl below the maximum limit, one Ahundred pounds, when the spring W overcomes the steam pressure below the diaphragm p and that device is forced down. In this movement the valve d is seated and the further passage of steam or water to the chamber U prevented.

The pressure in the nozzle mis now reduced to that of the atmosphere by the leakage of water or steam through the ,channel n', and in view of this, the Valve B is forced from its seat by the steam or water in the cylinder P and the port m exposed-which allowsthe contents of the cylinder P to escape through the nozzle C; but before the valve B is unseated the smaller valve g is seated which prevents the raising of the pressure in the nozzle m, or the establishment of an equilibrium of pressure in the cylinder P and the nozzle m. In this last described movement, the piston rod S is withdrawn from the lever Hand that device is then free .tobe operated solely by the combustion governor as before f described.

I claim as m`y inventionl. In combination with a lever operatedprimarily from a diaphragm which derives its movement from variations in pressure bei In this movement the' lIO IZO

' zo' be admitted tothe said inthe combustionchamgber ere, a steam or, water actu'- ated device which is setin operation by the Arisein pressure of the said steam or water pto a certain pre-arranged height, and whichdevice operates the said lever independently of the said diaphragm, substantially as specifedf 2. In combination with alever operated pri# marily froma diaphragm `whichderives itsv movement1 from variations in pressurev be-V tween the gasesin the combustion chamber and the atmosphere, a cylinder having a piston therein held yieldingly in a depressedposition by means of a spring with a pistonrod adapted in the rise of thesaid pistonby theapplication of steam orwater under pressure thereto to `move the said lever,` and valve -inechanism whereby upon the said steam or water. reachinga prearra'nged pressure, willl cylinder, and-the pisl placed in operation, substantially as speci tween the gases and the atmosph ron :fied v v 3. 'In combination lwith a lever operated primarily from a diaphragm which derives its.

movement from variations in pressureV be-V tween the `gases in the combustion chamber and the atmosphere, a steam or water actuated pistonand .-rod adapted to operate the'said a lever independently of the saiddiaphragm a 3Q valve to control the admission of steam, or

.water under pressure, to the said cylinderby the withdrawal from contact with the valve of a-stem held down bya'spring loaded dia;

` water cylinder havin ing tothe prearranged limit, substantially as specified. v

ing a damper in a chimney or iiue, a steam or g a loaded piston therein, and also a. piston'ro said damper actuati' ber having-therein a loaded diaphragm and f provided with a pipe toconvey steam froma boilerto the space under the said diaphragm, a stem with itsend bearing against the under side of 4the saidrdia restingon a valve and the steam cylinder having therein a perpressure of the entering steam, Iported inner valve to close the the main valve as steam press therefrom, the said chamber charge port which, is uncovers mainvalve is forced from its seat andthe "contents of the steam `or water cylinder discharged,siwstantially'as specied. p

5. In combination with the valve chamber `U having the channel n the` hollow `valve B having the opening 7c and' the spring supported valve g, sub`stantially as specified; i

' y GEORGE LANDER ,THIELL Witnesses:

a spring supperforation in ure is removed having a disa phragmwhich is overcome bythe steam ris- DANL. FISHER,

l-Z. F4 WILLIAMS.

4.' Infcombination' with devices for actuatd adapted to' operate .the ng devices, a valve champhragm audits lower end which controls the passage of water' under pressure' or steam to the said cond valve chamber in the forated hollow valve adapted toclose with the 

